Simple Ham Radio Antennas

GOING TO THE FIELD FOR FUN AND SERIOUS BUSINESS Considering the amount of natural and human-made disasters making headlines this year, every amateur radio operator should have a "go-kit" should it be necessary to support your community in times of emergency.  Once you have this kit, practice using it so it becomes part of your support package. A "go-kit" should be portable, easy to set up, and contain the necessary equipment to get an amateur radio station on the air for emergency service.  Your emergency kit should also contain sufficient food, water, clothing, medical supplies, and personal items to last at least three days--more days if you can squeeze more stuff in your vehicle. So, with this in mind, I took inventory of the "back up station" I alway take with me in my Honda Odyssey van.  The station is simple and functional.  I schedule several portable operations each year to test out the equipment and my ability to operate in the field.  In

How would you like to have a simple, effective antenna for 20 meters thast will give you some gain over a ground plane antenna and exhibit a radiation angle of approximately 15 degrees? You can grab more DX (distance) at a modest cost by building a 5/8 wavelength vertical antenna working in conjunction with 1/4 wavelength radials beneath the main radiating element. I've built 5/8 wavelength antennas for 10 and 15 meters and they work very well.  If you desire multiband performance out of this antenna, you will need a balanced feed line (such as 450-ohm ladder line), a 4:1 current balun, and a sturdy ATU ( antenna tuning unit ).  If you prefer to use this antenna on one band only, you can establish resonance with a base loading coil that tunes the antenna to 3/4 wavelength  resonance.  Standard 1/4 wavelength wire radials are used with both versions of this antenna. According to William I. Orr (W6SAI) and Stuart D. Cowan (W2LX), "a 5/8 wavelength antenna provides imp

Over the past few weeks, I've been experimenting with a 5/8 wavelength vertical antenna for 10 meters.  The antenna is a marked improvement over my 1/4 wavelength ground plane vertical for 28.400 MHz.  Some antenna experts believe the 5/8 wavelength vertical can deliver a 3 dB gain over the conventional vertical presented in most antenna books.  According to William I. Orr (W6SAI) and Stuart D. Cowan (W2LX), the "5/8-wave vertical provides improved performance DX-wise over the ground plane antenna and is recommended for those amateurs with restricted yard space who have 'nowwhere to go but up.'" With that in mind, I spent part of Saturday, 03 May 2014, building a 5/8 wavelength vertical for the 15 meter amateur radio band, with a preferred frequency of 21.260 MHz in the phone (SSB) portion of the band.  The antenna was simple, requiring some wire, a few wooden support stakes, some ceramic insulators, a "ladder lock" support for the feed line, a length

According to Edward M. Noll (W3FQJ), "The 5/8-wavelength vertical is a preferred length for the best low angle radiation."  For the higher HF bands (20 through 10 meters), this antenna is easily assembled and requires a small quantity of wire, some ceramic insulators, a suitable mast, 50-ohm feed line or 450-ohm feed line, a simple ground radial system, and a sturdy antenna matchbox or ATU .  Multiband use between 20 and 10 meters is possible with 450-ohm ladder line , ATU, and a balun, while good single band use can be obtained with 50-ohm coaxial cable and an inline or base antenna "tuner". So, let's build a simple 5/8 wavelength vertical for the 10 meter amateur radio band, centering on 28.4 MHz .  This frequency is at the mid-point of the SSB allocation for Technician Class licensees.  The antenna was built at my new home in the Puna District on 18 April 2014. MATERIALS: Using the general formula, 585/f (MHz)=L (ft), our vertical element will measur

During that brief period between getting my novice amateur radio license and moving on to the technician and general class license (1977-1983), I built several dipoles, inverted vees, and verticals.  All of these antennas worked very well, considering the lack of space I had at the time.  When my xyl and I moved from Honokaa to Laupahoehoe , we occupied a larger home and had more backyard space to place antennas. Just before I passed the Advanced Amateur License exam, I built what I considered my best and "most forgiving" antenna--a full-wavelength 40-meter loop.  The loop displayed some gain over a dipole at the same height, needed only one tall support, and didn't require a ground radial system to operate efficiently.  Using balanced feed line , a 4:1 current balun, and a Drake MN-4 transmatch, I could cover 40, 20, 15, and 10 meters with one antenna.  Later on, when 30 meters became available to amateur radio operators, I used a MFJ-941-E Versa Tuner II and my sp

Those of you who follow my Amateur Radio News Blog (http://kh6jrm.com) on a regular basis may be aware of two related radio stories that will have a significant impact on the future of amateur radio and the rf spectrum that we share with other services. The first article relates to comments made by FCC Chairman Tom Wheeler at the annual NAB convention today in Las Vegas, Nevada. In his speech before NAB delegates, Wheeler urged television broadcasters to abandon over-the-air transmissions in favor of streaming over the internet.  Wheeler says the migration to broadband internet would free up spectrum for the ever increasing demands of consumer electronics, from cell phones and iPads to mobile radio and other public services.  Already, VHF analog channels between channels 2 and 13 have moved to higher frequencies and now employ digital signals.  The now vacant channels won't remain idle for long, since these VHF allocations will be assigned to other services. The gradual appro

Over the past few posts, I've been describing some of the antennas I designed, built, and used during my days as a novice amateur radio operator (1977-1978).  Most of the working designs were copied into school theme books and saved for future reference. One of my favorite homebrewed antennas was a simple vertical  antenna supported by a high tree limb terminating with a slightly angled ground plane consisting of 10 radials.  The antenna was designed for 40 meters and worked very well for contacts throughout the Pacific Rim and the mainland United States . Last weekend, I decided to duplicate that antenna with some spare wire, ceramic insulators, coaxial cable , and basic tools. As mentioned earlier, the process of moving to a new home often uncovers items you once thought were lost.  Such was the case here when I found several 50-ft /15.24 meters rolls of #14 AWG house wire in the garage.  That wire would serve as the vertical element and the rudimentary ground radial sys

The Novice Inverted Vee Antenna Moving to a new QTH can be a lengthy process, especially when you're still working part time and must do all of the transporting yourself.  But in this drawn out activity, you have a chance to find things you were once thought lost forever. Such was the case this past Wednesday, when a state holiday gave me and my xyl a chance to move some more "stuff" from our rental house to our permanent location in the Puna District of Hawaii Island. Once most of the small objects, such as books, records, clothing, entertainment equipment, and, of course, amateur radio equipment is placed in their new surroundings, we can hire a commercial mover for the larger items, including beds, various pieces of furniture, and heavier items.  We'll probably take a few more months to get things everything squared away.  After all, both of us are supposed to be "retired".  We both teach school, so retirement is but another word to add to things o

Humans tend to collect things.  Amateur radio operators are no exception.  In my 37 years as a licensed amateur radio operator, I've collected enough electronics-related material to fill most of my garage/radio shack at my new home in the Puna District .  Fortunately, I've managed to keep things organized, more or less, with plastic storage bins and some old filing cabinets. During the ongoing moving process, I discovered antennas, books, logs, and parts once given up for lost.  Such was the case Monday, 17 March 2014, when I reorganizing some of the material brought to the new QTH.  I found several well-sealed boxes containing some of my successful antenna projects.  All the antennas were dipoles built during my over three decades of "warming the ether" with a variety of old tube rigs long since gone to to the great capacitor in the sky.  After I finished using these antennas, I had the foresight to clean and store them for future use.  Also along the back wall wa

Building wire antennas is one of the few amateur radio activities that remains fairly inexpensive.  Your nearest hardware store or home improvement outlet is chocked full of wire, connectors, pvc pipe, copper tubing, and basic tools to launch your antenna building efforts. Whether you make simple dipoles, inverted vees, loops, or even directional vertical arrays, the satisfaction of having built something that links you to your fellow amateurs around the world is beyond compare.  If the antenna doesn't meet your expectations, you can salvage most of your material and try again.  It's all part of a continuing educational experience that can last a lifetime.  Add to this mix a few simple transceiver kits or accessories and you have something that will be your faithful radio companion for many years. I approach my antenna "adventures" with that sort of mindset, and I'm always on the lookout for intriguing antenna ideas that I can modify for my own use. Such wa

Like many amateur radio operators, I've collected many boxes of electronic parts, various lengths of coaxial cable , and assorted rigs over the past 38 years.  I suppose my "shack" is testament to my "pack rat" tendencies.  I rationalize this collective habit by saying all of this material will become useful some day.  That some day was Thursday, 13 March 2014.  I had several lengths of RG-58 coaxial cable that had seen better days.  The assorted 100-ft/30.48 meters and 50-ft/15.24 meters lengths were gathering dust in the corner of the garage serving as the storeroom for my radio room.  The connectors were in good shape and the vinyl covering was intact, although a bit grey from sun exposure.  I wanted to find a use for the old cable ,now that it had been "retired" from active service. Why not use the old coax as a low noise receiving antenna for 80 meters, which was a very noisy band even in my remodeled home in the Puna District of Hawaii Islan

Whenever I get a day off from my substitute teaching duties, I try to attend meetings of the Hawaii QRP Club at the Hilo, Hawaii Jack In The Box Restaurant.  The meetings usually last from 0600 to 0900 local time and cover a variety of topics, from antennas to homebrewed equipment.  Attendance varies from to 2 to 7 or 8 persons, depending on who's working or free for the day.  Dean Manley (KH6B) usually brings some of his antenna notebooks and his vast storehouse of experience as a radio broadcast engineer to the meetings.  There's always something interesting or new at these gatherings. Recently, some of us have been discussing homebrewed antennas that can be operated from areas restricted by HOAs, CC&Rs , or just plain lack of space.  One of the most intriguing antenna ideas came from the late Sam Kumukahi (KH6AFS), who, during the 1990s, used what he called a "James Bond" antenna with excellent results for local and occasional DX contacts.  At the 27 Febr